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