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