One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,9)(5,10)(6,7)(11,13)(12,16)(14,15)(17,18)(19,22)(20,23)(21,26)(24,29)(25,28)(27,31)(30,32)(33,34)(35,38)(36,43)(37,39)(40,44)(41,47)(42,45)(46,48) involution — undirected(2,7)(4,8)(10,15)(12,13)(17,18,22,19)(20,25,28,23)(21,24,29,26)(27,31,32,30)(33,35,37,42)(34,38,39,45)(36,41,44,48)(40,46,43,47)(18,19)(23,25)(24,26)(30,31)(34,39)(38,45)(40,43)(46,47) involution — undirected(1,3,6,9)(2,8,7,4)(5,11,14,16)(10,13,15,12)(17,19,22,18)(20,25,28,23)(21,26,29,24)(27,31,32,30)(33,34)(35,38)(36,40)(37,39)(41,46)(42,45)(43,44)(47,48)(1,4,6,8)(2,9,7,3)(5,13,14,12)(10,11,15,16)(17,20,22,28)(18,23,19,25)(21,27,29,32)(24,30,26,31)(33,35)(34,38)(36,41)(37,42)(39,45)(40,46)(43,47)(44,48)(1,5,6,14)(2,10,7,15)(3,11,9,16)(4,12,8,13)(17,21,22,29)(18,24,19,26)(20,27,28,32)(23,30,25,31)(33,36)(34,40)(35,41)(37,44)(38,46)(39,43)(42,48)(45,47)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.