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