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