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