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