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