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