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