One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18,23,26)(19,27,28,31)(20,29,32,24)(21,25,22,30)(9,10)(11,15)(12,14)(13,16)(17,19,21,29,23,28,22,24)(18,20,30,31,26,32,25,27)(2,5)(6,8)(9,11,12,16)(10,13,14,15)(17,20,23,32)(18,24,26,29)(19,25,28,30)(21,31,22,27)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(17,21,23,22)(18,25,26,30)(19,24,28,29)(20,31,32,27)(19,28)(20,32)(24,29)(27,31) involution — undirectedA 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.