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