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)(24,29)(30,40,32,39)(31,36,43,38)(33,41)(37,46)(44,47)(45,48)(1,3)(2,7)(4,12)(5,14)(6,13)(8,15)(9,11)(10,16)(18,23)(19,29)(21,35)(24,38)(25,37)(26,27)(28,36)(30,32)(33,46)(39,48)(40,47)(41,42) involution — undirected(2,8)(7,15)(9,10)(11,16)(17,19,22,29)(18,24,27,28)(20,32,34,30)(21,31,35,43)(23,36,26,38)(25,40,42,39)(33,45,46,44)(37,48,41,47)(1,4,6,5)(2,9,8,10)(3,12,13,14)(7,11,15,16)(17,20)(18,25)(19,30)(21,33)(22,34)(23,37)(24,39)(26,41)(27,42)(28,40)(29,32)(31,44)(35,46)(36,47)(38,48)(43,45)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.