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