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