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