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