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