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)(19,27)(20,25)(21,33)(22,24)(23,29)(26,35)(28,41)(30,40)(31,38)(32,45)(34,36)(37,43)(39,44)(42,48)(46,47) involution — undirected(9,10)(11,15)(12,13)(14,16)(17,19,22,30)(18,23,24,36)(20,28,31,42)(21,34,35,29)(25,37,38,47)(26,40,33,27)(32,46,44,43)(39,48,45,41)(2,5)(6,8)(10,13)(14,15)(18,24)(20,31)(23,36)(26,33)(27,40)(28,42)(32,44)(43,46) involution — undirected(9,11,12,16)(10,14,13,15)(17,20)(18,25)(19,28)(21,32)(22,31)(23,37)(24,38)(26,39)(27,41)(29,43)(30,42)(33,45)(34,46)(35,44)(36,47)(40,48)(1,3,4,7)(2,6,5,8)(20,31)(25,38)(28,42)(32,44)(37,47)(39,45)(41,48)(43,46)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.