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