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