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