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