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