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