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