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