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