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