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