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