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