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