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