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