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