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