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