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