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