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)(17,18,21,26)(19,28,30,23)(20,27,22,25)(24,31,32,29)(2,5)(3,7)(9,11)(10,13)(12,16)(14,15)(17,19,21,30)(18,23,26,28)(20,31,22,29)(24,25,32,27)(11,16)(13,15)(17,19)(18,24)(20,29)(21,30)(22,31)(23,27)(25,28)(26,32) involution — undirected(2,5)(6,8)(10,14)(13,15)(17,20,21,22)(18,25,26,27)(19,29,30,31)(23,24,28,32)(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.