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)(19,25,27,32)(20,29,28,23)(21,31,30,26)(1,3,4,8)(2,5,6,7)(9,10)(11,13)(12,14)(15,16)(17,19,21,28,22,27,30,20)(18,23,26,25,24,29,31,32)(2,6)(3,8)(9,11,12,15)(10,13,14,16)(18,24)(19,27)(20,28)(26,31)(2,6)(5,7)(10,14)(13,16)(18,24)(23,29)(25,32)(26,31) involution — undirected(2,6)(5,7)(17,20,30,27,22,28,21,19)(18,25,31,23,24,32,26,29)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.