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