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