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