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