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