One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,8)(6,7)(9,13)(10,12)(11,14)(15,16)(17,18)(19,22)(20,23)(21,26)(24,29)(25,28)(27,31)(30,32)(33,34)(35,42)(36,40)(37,45)(38,39)(41,47)(43,44)(46,48) involution — undirected(4,11)(8,14)(10,15)(12,16)(17,18,22,19)(20,25,28,23)(21,24,29,26)(27,31,32,30)(33,34)(35,36)(37,41)(38,39)(40,42)(43,44)(45,47)(46,48)(2,7)(3,9)(8,14)(10,15)(18,19)(23,25)(24,26)(30,31)(34,39)(35,40)(41,45)(43,48) involution — undirected(1,3,6,9)(2,5,7,13)(4,10,11,15)(8,12,14,16)(17,19,22,18)(20,25,28,23)(21,26,29,24)(27,31,32,30)(33,35,38,40)(34,36,39,42)(37,43,47,48)(41,44,45,46)(1,4)(2,8)(3,10)(5,12)(6,11)(7,14)(9,15)(13,16)(17,20,22,28)(18,23,19,25)(21,27,29,32)(24,30,26,31)(33,36)(34,40)(35,39)(37,46)(38,42)(41,43)(44,47)(45,48)(1,5)(2,9)(3,7)(4,12)(6,13)(8,15)(10,14)(11,16)(17,21,22,29)(18,24,19,26)(20,27,28,32)(23,30,25,31)(33,37)(34,41)(35,43)(36,44)(38,47)(39,45)(40,48)(42,46)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.