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