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