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