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