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