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