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