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