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