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