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