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