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