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