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