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