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)(13,14,18,20)(15,16,17,19)(21,22,25,28)(23,29,30,26)(24,32,33,27)(31,34,36,35)(8,12)(10,11)(13,15,18,17)(14,19,20,16)(23,30)(24,33)(26,29)(27,32)(6,7)(10,11)(15,17)(16,19)(21,23)(22,26)(24,31)(25,30)(27,34)(28,29)(32,35)(33,36) involution — undirected(1,2)(3,4)(5,7,9,6)(8,11,12,10)(13,16,18,19)(14,15,20,17)(21,22)(23,29)(24,27)(25,28)(26,30)(31,35)(32,33)(34,36)(5,8)(6,10)(7,11)(9,12)(13,17,18,15)(14,19,20,16)(21,24)(22,27)(23,31)(25,33)(26,34)(28,32)(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.