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