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