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