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