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