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)(11,13)(12,14)(15,16)(17,18,20,24)(19,26,27,22)(21,23,29,25)(28,31,32,30)(2,5)(6,7)(9,11)(10,13)(12,15)(14,16)(17,19)(18,22)(20,27)(21,28)(23,30)(24,26)(25,31)(29,32) involution — undirected(13,16)(18,23)(21,29)(22,30)(24,25)(26,31)(28,32) involution — undirected(1,3,4,8)(2,6,5,7)(18,24)(19,27)(23,25)(28,32)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.