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