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