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