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