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