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