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