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