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