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