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