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