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