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