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