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