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