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)(15,16)(17,18)(19,20)(21,22,25,26)(23,27,30,34)(24,28,33,32)(29,35,31,36)(1,2,3,4)(5,6,9,8)(7,10,12,11)(13,15)(14,19)(16,17)(18,20)(22,26)(27,34)(28,32)(35,36)(1,2)(3,4)(6,8)(10,11)(13,16,18,19)(14,20,17,15)(21,23,25,30)(22,27,26,34)(24,31,33,29)(28,36,32,35)(5,7,9,12)(6,10,8,11)(13,15)(14,16)(17,19)(18,20)(21,22)(23,27)(24,32)(25,26)(28,33)(29,36)(30,34)(31,35)(5,8,9,6)(7,10,12,11)(13,17,18,14)(15,16,20,19)(21,24)(22,28)(23,29)(25,33)(26,32)(27,35)(30,31)(34,36)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.