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