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