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