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