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