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