One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,8,9)(7,10,11,12)(13,14,17,19)(15,18,16,20)(21,22,26,31)(23,32,35,29)(24,27,34,36)(25,28,33,30)(1,2,3,4)(6,9)(10,12)(13,15,17,16)(14,18,19,20)(21,23,33,34,26,35,25,24)(22,27,28,29,31,36,30,32)(2,4)(5,7)(6,10)(8,11)(9,12)(14,19)(18,20)(22,28)(23,34)(24,35)(25,33)(27,36)(30,31) involution — undirected(7,11)(10,12)(13,16,17,15)(14,20,19,18)(21,24,33,23,26,34,25,35)(22,29,28,36,31,32,30,27)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.