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